Airscrew



Dec. 2s, 1926. 1,612,696`

RRRRRRR l l RRRRRR EW Patented Een. 2g, 1926.

uuiTEo STATES REZS BRES7 OF KOBOLKUT. CZECHOSLOVAKIA.

AIBSCREVI.

Application filed August 7, 1926, Serial No. 127,921, and in Hungary April 4, 1925.

This invention relates to auxiliary rotor devices for airscews (propellers).

lfn airscrews having a high speed of rotation air is forced backwards between the vanes or blades. at a considerable velocity in a direction opposite to the direction of travel. This air possesses a substantial amount of kinetic energy and it is the object of the present invention to utilize such energy.

For the solution of this problem a blade wheel or rotor is mounted on the shaft of the .air screw, to the rear of the latter. (having regard to the direction of travel) the blades of said rotor being either straight or curved but., in either case, always parallel to the di rection of travel. In other words, said blades must not form an angle with the direction of travel. This rotor is mounted on a hollow shaft which, in turn, is mounted rotatably on the shaft of the airscrew and it is rotated by "he current of air or slip stream forced back n an acute angle between the vanes or blades of the said screw.

In the accompanying drawing, which shows one const notional form of the auxiliary rotor device according to the invention,

Fig. l is a sectional side view of an airscrew and rotor, while Fig. is an end view thereof.

In this drawing the reference character a represents the airscrew, which may loe provided with two or more vanes or blades, the latter being secured at their inner ends to a drinn shaped hub L, keyed to the screw shaft o and at their outer ends to a ring 7U. On the drum-shaped hub 7i is fastened a Cone a, with its point directed outwards, which serres to reduce the air resistance.

fn accordance with the invention an auxilirvy blade wheel or rotor is mounted on the screw shaft and this rotor is constructed in the following manner:

A hollow shaft (l is mounted rotatably on the screw shaft Z) behind the airserew (having` regard to the direction of travel) and upon the end thereof is fastened the drumshaped hub This latter is equal in diameter to thehub [7i and is arranged behind the same, with a small clearance. The inner ends of the blades c are. fastened to the hub e, while. their outer ends are united by a ring` o. T he blades c may be straight or curved but whichever kind of surfaces is chosen, however. their ,eeneratrices must always be parallel to thel direction of travel. In order that the air may be properly guided and that no stray currents or eddies may be set up, it is desirable that the rings and g mutually overlap. in the arrangement shown in the drawing the ring g slightly overhangs the rina 7.

lirorder to utilize the power obtained from the blade wheel z', c, g, any preferred form of transmission gearing arranged between the'screw-Shaft and the hollow shaft (Z may be employed and by this means the power is taken off in any convenient manner, when it may be employed, for instance, for supplementing` the effect of the airscrew.

The auxiliary rotor device above described may, for example, be used with aircraft, watercraft or various other kinds of vehicles.

lVhat I claim is:

l. In combination with an airscrew a rotor mounted rotatably on the shaft of the airscrew and to the rear of the latter, having' regard to the direction of travel and provided with blades the generatrices of which are parallel to the direction of travel.

2. ln combination with an airscrew a rotor mount-ed rotatably on the shaft of the airscrew and to the rear of the latter, having regard to the direction of travel and provided with straight blades the generatrices of which are parallel to the direction of travel.

8. ln combination with an air-screw a rotor n'ionnted rotatably on the shaft of the airscrew and to the rear of the latter, having regard to the direction of travel and rings surrounding the airscrew and the rotor and arranged in mutually overlapping relation.

In testimony whereof affix my signa ture.

REZS BRES. 

